Intense Blue (Phthalo Blue) is a deep intense blue which when undiluted, forms an inky blue-black. It is made from the modern pigment Phthalocyanine which was introduced in the 1930s.

Cotman Watercolours use fine art pigments with reduced pigment load than the Professional Watercolour range, making them an accessible choice while still uncompromising on quality. Rated AA and A for Excellent and Good lightfastness, Cotman Watercolour gives artist the reassurance expected from a quality watercolour range.